backupvalue
nounUK /ˈbækʌp ˌvæljuː/
US /ˈbækʌp ˌvæljuː/
A backup value is a second value you keep in case the first one does not work.
If the first number is missing, the computer uses the backup value instead.
OTHER MEANINGS
2. In computing, a stored copy of data used to restore information if the original is lost.
The system saved a backup value of the settings before the update.
3. In math or science, an extra measurement kept in case the main one is wrong.
The scientist recorded a backup value for each reading.
4. In everyday life, a second choice kept ready in case the first plan fails.
Her backup value for the trip was to stay home and save money.